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Possible Causes

Possible Causes 
(K399) O2 2/2 HEATER CONTROL CIRCUIT SHORTED TO GROUND
(K399) O2 2/2 HEATER CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
2/2 OXYGEN SENSOR
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See  DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure  . 

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